Multiple Superconducting Phases under Pressure for Different Field Directions in UTe2
Dai Aoki, Atsushi Miyake, Ai Nakamura, Yoshiya Homma, Dexin Li, Shota Mizuno, Georg Knebel, Daniel Braithwaite, Jean-Pascal Brison, Jacques Flouquet
Abstract
The existence of multiple superconducting phases is a striking feature of UTe2, arising from the spin and orbital degrees of freedom and supporting a spin-triplet superconducting state. We present field-temperature phase diagrams under pressure for fields applied along the three principal crystallographic axes, as determined by AC calorimetry measurements. The pressure evolution of the multiple superconducting phases is highly anisotropic with respect to magnetic field direction, revealing rich superconducting phenomena arising from complex fluctuations.
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